Chemical Tests for Functional Groups
Learn the qualitative tests for aldehydes, ketones, and carboxylic acids, such as Tollens', Fehling's, and others.
Why this shows up in the exam
You must recognize which test identifies which functional group.
How NEET tests this
Practise it
These are real questions from past NEET papers that test this exact idea.
Fehling's solution 'A' is
Push further
More challenging14 harder questions built from the past papers above — a step up in difficulty, with distractors designed so you can't get there by elimination. Written and checked by our reviewers, not from a real paper.
An organic compound 'P' (C5H10O) gives a positive iodoform test, but does not react with Tollens' reagent. When 'P' is reduced with NaBH4, it forms an alcohol 'Q'. 'Q' on dehydration gives an alkene which on ozonolysis yields ethanal and propanal. Identify the structure of 'P'.
More from Aldehydes, Ketones and Carboxylic Acids
Nucleophilic Addition to Carbonyl Compounds
Learn the mechanisms and outcomes of nucleophilic addition reactions to aldehydes and ketones, including cyanohydrin, hydrazone, and Schiff base formation.
Reactions of Carboxylic Acids and Their Derivatives
Study nucleophilic acyl substitution, esterification, hydrolysis, decarboxylation, and formation of anhydrides, imides, and acyl chlorides.
Preparation of Aldehydes
Learn the main laboratory and industrial methods for synthesizing aldehydes, including oxidation, reduction, and named reactions.
Aldol Condensation and Related Reactions
Learn the mechanism, requirements, and products of aldol condensation, including cross-aldol and dehydration to α,β-unsaturated carbonyls.
Reduction and Oxidation Reactions
Study the reduction of carbonyl and carboxylic compounds to alcohols or hydrocarbons, and their oxidation to acids or other products.
Acidity of Carboxylic Acids
Understand the factors affecting acidity, including substituent effects, resonance, and hydrogen bonding.